550: Mailbox Unavailable
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Others
Language: English
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Frequently Asked Questions:
What is the full form of 550?
550 stands for Mailbox Unavailable.
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"550." Fullformexpand.com, https://www.fullformexpand.com/550/756423. Accessed 2 Dec. 2025.
Fullformexpand.com, 2025. "550." Accessed December 2, 2025. https://www.fullformexpand.com/550/756423.
"550." (n.d.). Fullformexpand.com. Retrieved December 2, 2025, from https://www.fullformexpand.com/550/756423.
550. (2025). Fullformexpand.com. Available at: https://www.fullformexpand.com/550/756423 (Accessed: 2 December 2025).
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